| Layer | As we build it | What it does | If you halve it |
| Outer skin | 0.28mmカラー鋼 | Takes the weather and holds the paint colour | 0.15 mm dents at a hand push |
| Skin coating | Zinc plus polyester topcoat | Corrosion barrier at cut edges | Cut edges rust inside one wet season |
| Adhesive | Two-part PU, 180 g/m² | Bonds skin to core across the full face | Skin delaminates above 60 °C surface |
| Core, walls | 50 mm rock wool, 65 kg/m³ | Fire grade, sound control and shape retention | 40 kg/m³ wool sags over 2 m height |
| Core, roof | 30 mm rock wool, 60 kg/m³ | Insulation without adding roof depth | 20 mm roof panel condenses on the ceiling |
| Inner skin | 0.28mmカラー鋼 | A cleanable face that hides the core | 0.20 mm ripples between ribs |
| Panel edge | Folded lip, gasket channel | The joint that actually seals | A cut edge needs a trim and still leaks |
| Panel width | 1150 mm nominal | Fits the 2500 mm module without a rip cut | A 1000 mm panel wastes 150 mm per wall |
| Panel weight | About 11.5 kg/m² at 50 mm | Two people carry one panel without a hoist | 9 kg/m² feels light and sounds hollow |
| U value | 0.80 W/m²K at 50 mm wool | Sets the heating and cooling load | 1.3 W/m²K at 30 mm wool |
| Fire rating | Class A as an assembly | Insurance and port acceptance turn on this | B1 with EPS, rejected by some ports |
| Sound reduction | About 30 dB at 50 mm | Speech from the next room is muffled | 24 dB, conversation carries |
| Service life | 15 years with coating intact | Paint cycle rather than a panel swap | 8 years if edges are left bare |